Display panel or portion thereof with a graphical user interface



FIG. 1 is a front view of a display panel or portion thereof with a graphical user interface showing a first embodiment of our design;

FIG. 2 is a front view of a display panel or portion thereof with a graphical user interface showing a second embodiment thereof;

FIG. 3 is a front view of a display panel or portion thereof with a graphical user interface showing a third embodiment thereof; and,

FIG. 4 is a front view of a display panel or portion thereof with a graphical user interface showing a fourth embodiment thereof.

The drawings of FIGS. 1-4 are variously filled to represent color. In particular, the right to left diagonal lines represents green; the crossed hatched pattern represents red, the left to right diagonal broken lines represents orange; the up to down vertical lines represents blue.

The outermost broken line illustrates a display panel or portion thereof forms no part of the claimed design. The remaining broken lines, including all text, illustrate portions of a graphical user interface and form no part of the claimed design. 

CLAIM The ornamental design for a display panel or portion thereof with a graphical user interface, as shown and described. 